<!DOCTYPE html>
<html>
<head>
<link rel='match' href='percentage_width_inline_block_ref.html'>
<style>
section {
    display: inline-block;
    width: 100%;
    background: steelblue;
    color: white;
}
</style>
</head>
<body>
Y<section>X</section>
</body>
</html>

